Relief device for rolling mills



l 1,468,825 Sept. 25 1923. N. METZ V RELIEF DEVICE FOR ROLLING MILLS c v Filed Aug. 14, 1919 9 Sheets-Sheet 1 Sept. 25 1923.

N. METZ RELIEF DEVICE FOR ROLLING MILLS Filed Au 14, 1919 s Sheets-Sheet 2 Sept. 25,1923. 1,468,825

N. METZ RELIEF DEVICE FOR ROLLING MILLS Filed Aug. 14 1919 9 Sheets-Sheet 5 fiif'izasss segt. 25, 1923.

N. METZ RELIEF DEVICE FOR ROLLING MILLS Filed Aug. 14 1919 9 Sheets-Sheet 4 Sept. 25,1923. 1,468,825

\ N. METZ I RELIEF DEVICE FOR ROLLING 'MILLS Filed Aug. 14 1919 9 Sheets-Sheet 5 [72 yevzzar Sept. 25, 1923.

, N. METZ v RELIEF DEVICE FOR ROLLING MILLS Filed Aug. 14, 1919 9 Sheets-Sheet 6 r Sept. 25,1923. 1,468,825

N. METZ RELIEF DEVICE FOR ROLLING MILLS FiledAug, 14, 1919 9 Sheets-Sheet v Sept. 25, 1923. 1,468,825

N. METZ RELIEF DEVICE OR ROLLING MILLS Fil ed Aug. 14, 1919 9 Sheets-Shet a Sept. 25,1923. 1,468,825

. N. METZ RELIEF DEVICE FOR ROLLING MILLS Fi led Aug. 14, 1919 9 Sheets-Sheet 9 Patented Sept. 25, 1923.

imiTEo-sraras vnon B1335:ivin'rz, or.DUDn r GEmriTxni/IBURG. l i

RELIEF avids FOR' noLLInef M'ILLISQTT Application'filed August 14, 1919."Seria1 =N0. 317,613.

- rename]: UNDER THE rnovrsrons or rnaac'r or MARCHG, '1921, ii STAT.-.I.., 1313.

To allj whom it may concern."

Be it known that I, NORBERT Mn'rz, a citizen of the Grand Duchy of Luxemburg, residing'at Dudelingen, Luxemburg, have in vented certain new and useful Improvementsin Relief Devices for Rolling Mills (for which I have filed applications for .patent in Germany, July 17, 1917, and December 10, 1917 and in Hungary-,April 17, 1918, in the name of the Vereinigte' Hutten- 'werke Burbach-Eich-Dudelingen of -Dude-' lingen, Grand Duchy of'LuXemburg),1o-f which the'following is a specification. ,I

This invention relates to-the working of rolling-mills and has for its object to provide means for instantaneously interrupting the pressure which is produced between the rolls by the rolling-process. When the driving machine stops whilst a bar is held between the rolls, or when a bar is'wound round one of the rolls, the tension between the two rolls must be done away with. This is hitherto efi'ected by loosening the press.-

ing-screws. If one does not succeed in doing" so, the wedges of the cap-bolt must be loosened, and if even this cannot be effected, nothing is left but bursting asunder the breaking-piece,-or forcibly removing the' same between the pressing-screws and the intermediate piece. i

These operations are difficult and wearisome. The bar becomes cool and in reversing the machine the caliber maybe damaged by the cooled bar. Therefore it would be of great utility and would afford a consider able progress in the operation of rollingmills if a means for instantaneously loosening the rolls could be procured.

My invention enables me to produce such a device. It consists, broadly speaking, of a suitable vessel or container filled with balls or rolls or other bodies of sufficient strength and closed by a piston-like cover which vessel is interposed between the parts of the frame which are to be loosened under the pressing screw. under the brackets. or on the wedges,) so that the cover of the vessel is loosened as soon as the balls, rollers or the like are withdrawn. j

The apparatus is illustrated in' the accompanying drawings, of which Figure 1 is a vertical section of an apparatus embodying my invention.

Fig. 2 is a plan view thereof.

. shows aplan viewthereofx. r

' 3 a vertical section of another form of the apparatus having an annular containeran'dan annular cover,'and 4 1 .'Fig.-, 5 is a. vertical sectionof an-apparatus as shown in Figs. 1 and 2 provided with a device for removing obstructions of the-balls and for collecting the same.

Fig. 6 is a vertical section, and Fig. .7 "a

horizontal] section of the apparatus, the f vessel; foricollecting the balls being f a other form j 7 9 Figs. 8 and 9. Show in verticaland hori zontal section respectively a modified form of thecollectingvessel being integral with the container.

' l Y Fig. 10;.is -a verticalsection, and Fig. 11} a plan view-. showingmodification of the apparatus represented in Figs.,j8 and 9, the

-,container; and the cover being ofannular form:

Figs. .12 and area-vertical section and a plan view, respectively, of another modifica- V t1on, .-1the cover being countersunken and aida ted for receiving thebreaking-pOt.

Figs. 14 and 15; are a vertical section and aplan view respectively, of another modification, showing a countersunken; annular cover receiving-the head of'the cap-bolt. 1

Figs. 16and317 represent in vertical section-andplanview, respectively, a modificationxofthe apparatus shown in Figs. 14 and .the, ball collector beingflintegral ith: the container; I

Fig. 18 is a vertical, and Fig. 19 a horizontalsection of a modification inwhich the pressure is. suddenlyredu'cedlby withdrawingjfa wedge-penetrating into' the container.

I Fig. 20 is ajvertical section, 21 a-hori zontal section, and-Fig. 22 a plan view of a modification in which thestationary wedge of the-rolling mill forms the container. T z Fig. 23 is a 'vertical, and Fig. 24 a1 hori- 'zontaljsectionof an apparatus in which the pressure is controlled by a weighted lever actingon a piston.

"andi26 show-in and hori} zontal: section, respectively, '1 a modification, 1

the'piston being controlled by a spring.

In Fig. 27. I have shown-in what manner the apparatus forming theinventioni may be disposed in various places -ofthe rolling mill. V

"The apparatus consists of a cylinder a" balls is of annular form. a, is the annular cylinder, 7) the outlet opening, cthe. annular cover, (Z the plug, '6 the appendix.

The apparatus is arranged in the frame of the rolling-mill in such a manner that-1t receives the pressure to the rolls. When the releasing device is removed, theballs flow a tubular piece f is secured the'bottom of which is closed by a plug it through which a rod 2' is passed. The tube 7 is connected with the ball-collector g;- As soon as theballs cease to flow out, the rod z is knocked in.

The-reupon, the balls continue to and-the cover o'sinksdown. 7

' The ball-collector may be attached to or cast with the cylinder or the ring: In one modification the ball-collector and its rod is'disposed beside the cylindrical form'containing the balls and is attached to or cast flow I out with this form. This arrangement has the advantage that when the plug d is removed, the ball-collector is always at the prescribed place and no'balls are loston removing the ball-collector after the rollsare loosened. Moreover, the interior of the ball-collector may be bored out conically so that the outlet is always disposed'in the direction of the axis of this cone. By turning the apparatus the balls may be passed back into thecylinder. The rod is then most useful for driving the balls into the main device;

In'Figs. 6 and 7 of which Fig.' 6 shows a vertical central cross section, Fig. 7 a horizontal section through the line 7,'( in Fig. 6,0? is the'cylin'der containing-the'ba lls, b the outlet opening, 0 the piston-like cover. (Z the plug, f the ball-collector, i therod for loosening the balls when'they become jammed, which mayp'enetratethrough the opening 79 of the ball-collector into the outlet opening 6 n is an opening for removing the balls from the-ball-collector.-

The Figures 8 and 9 show a roll-loosener in which the ball-collector is disposed under the part containing the balls, Fig. 8 being a vertical cross-section, Fig. 9 a horizontal section through the line 9-9 in Fig- 8. a is the cylinder with the balls, the bottom of which is cone-shaped, b is the outlet opening, c the piston-like cover, (Z the plug, f the ball collector the pin or ball-or roll loosening. member which is ope-rated by means of'a lever m pivoted around the axis Z. 7.: is theopening for removing the balls from the ball-collector. The outlet-opening is disposed in the middle of the cylinder the bottom part of which is of conicalform. The top of the ball-collector is'cone shaped 'too. ,In'this manner, it is possible to return theballs into the upper part of the apparatus by turning it, whereby any'loss of balls is prevented.

' In such apparatus having a central out- I let it the pressure is not considerable one may employinstead of balls other solidnoncompressible bodies having the required resistance. l In Figs. 10 and 11 the apparatus is of annularform, Fig. l0 beinga vertical section, Fig. '11 a plan view. The ball-collector is placed immediately under the ring containing the balls. one or more outlet openings- The bottom of 00 It may be provided with the ring is here sloping against the outlet opening. In Figs. 10 andl'lz asis the ring, 6* the outlet opening, 0' the annular cover, (i the locking plug, 7 the ball-collector, i the looseni'ng memberoperated by the lever m. piv oted around the axisl, 70 the bottom closing the ball-collector, and provided withone or more openings a for removing the balls. 9 is the cap-bolt connecting the head of the frame with the frame itself. j

Whilst the ring form heretofore has been described as consisting of a hollow ringi-n which the annular cover fits, it may be formed of a flanged pot-like cover or a cover with countersunken bottom and a rin'g having an interior collar at its" bottom. This device is shown in Figs. 12 and 13,

Fig. 12 being a vertical section and Fig.f13

a plan view.

In these two figures, c is the cover with countersunken bottom 0 a is the outer flanged ring. Both are united in'such a manner that an annular hollow space 1 for receiving the balls or the like is formed. The outer flange of the cover carries an open ing 8 for filling the b alls' into the annular space 7 I 1 To avoid displacing of the parts a and c clamps 6 may be secured to the ring a. Instead ofthese clamps, a ring may be used having the same cross-section as the clamps and protecting the apparatus against dust and the like. r i

b is the, outletbpening, 6Z5 the plug, i the loosening member, 2 the opening, through which this loosening member penetrates the ball-collectorf 115 the opening for removing the balls fronrt'heball-collector, the breaking-pot of the frame standing on the 'countersunken bottom.: r

For introducing the balls, the cover 0 is so positioned that an annular space 1' of sufficient height is formed. This space is filled with balls through opening 8 where-g upon thelatter is closed by a screw. I

In Figs.- 14 and 15 theannular vessel is formed by two rings ofangular'cross section, which the cap-bolt passes through Fig. 14'shows a vertical cross-section. Fig. 15 a plan view of the apparatus. Most of the reference letters signify thesame parts .as in Figs; 12 and 13. I

' scribed as flowing out of the interior of the vessel, the pressure may bedischargedby withdrawing a wedge-like bod'yl projecting into'the balls, The balls then replace the withdrawn body, the cover is lowered and the pressure of the rolls'i's done away with. This device is shown in Figs. 18 and 19, of which Fig.18 is a vertical, Fig. 19 a horizontal section through the apparatus.

m is the cylinder, 1' its cavity filled with balls, a the pistondike' cover, u? the wedgelike body projecting 'into the cavity filled with balls, 6 the opening of the cylinder a through which the body u is withdrawn, 0 the rod for removing the body u w? the jack carrying the rod 0 and w the sleeve for guiding the rod o.

The body a is operated by'means of levers or screws. Instead of steel balls, in the case of reduced pressures sand or other globular bodies of sufficient strength may be employed. A plurality of wedge-like'bodies u may be provided inthesamecavity. In Figs." 1 to 19 only CY'llIlClI'lClh'COIILCfilor angular forms of the ball-container are provided. In the last-mentioned case, the ballcontainer may be of any form.

Also one of thema-in parts securing the rolls, for instance the wedges and brackets may be provided with recesses, which maybe filled with balls and serve for loosening the rolls. In Figs. 20, 21 and 22 a wedge is provided with such a recess. Fig. 20 shows a vertical longitudinal section throughthe system of wedges, Fig.21 a vertical cross section, and 22a plan View.

1 means the upper stationary wedge, "2 a recess secured in this wedge filled with balls,

-the frame.

under the nut 26 of the cap-bolt 9.

3 the cover-closing the recess ('Fig. 22),.4 r the outlet-opening, 5;;the plug, 6 the rod for removing-the obstructions, 7 the ball collector,-8 the opening through which thev I loosening member 6 penetrates into the ball-- collector, 8 the opening;-for'removingthe balls from'the balhcollector, 9 the inferior 1 movable wedge, 10 thethrea-d of this wedge, 11 the corresponding sleeves, 12 the frame of the rolling-mill, 13 the bracket-g of the frame',which-receives the ;pressure from the rolls, 14 the -middle intermediate blockf 'of-i In the case of sheet-rOlling-mills, therolls of which are exposed to strong blows or, strokes and in wh ch on the other hand the ingot shall be reduced to the desired thick. ness byrepeatedly rolling to and fro,"s'uch devices. may be advantageously employed for avoiding'the breaking of the journals. Besides the providedj-outlet-ope ning I the roll-looseners are then provided .with

pressure regulating device, which "consists of a'p-iston moving in a cylinder. This piston is ad uSted by means of a counter-weight or an helical spring so that no sooner is it displaced than the force exerted by the balls surpasses the resistance of the weight or'of the helical spring. 1

-Such devices areflshownin Figs. 23 to '26.

26 are horizontal cross sections. Concurc-ountere 7 i Figs. 23 and 25 are vertical, Figs. 24 and I rently in Figs. 23 to 26 a, means thecylinder, b the piston-like cover, 1* the ball-' vessel,.-15 the opening by which the cylin "der 16'is discharged, 17 the piston'receiving the pressure, 18 thepiston-rod, Z)? (Figs. 24- and 26) the outlet opening, d the plug,;" theball-collector, i the percussor.

In Figs.23 and 24, 19 is the lever pivoted around the shaft 20,21 the rod bearing the counter-weight 22 and operating the lever 19.

' In Figs. 25 and 26, 23 is the helicalspring. 3:10"

The wedges shown in Figs. '13 and 14 also may be subjected to the pressure of springs" or weights. V

In the place marked I. it is arranged between the pressure screw 24 and the block the different places are indi- 25. Should notwithstanding this devicelthe l breaking-pot be necessary, it may beinsert cd between: I and-the pressure screw. In

heavy rolling trains, it may be of advantage to protect this device againstexaggerated pressure." In this case it is disposed at II 1, e represent the wedges securing the cap-bolts to the standard. In this case cylinder and cover fare m'ade annular.

l PWhenthe loosening device'is disposed at i I and II, the upper and the middle",

roller may be promptly loosened.

-When disposed at II the apparatus effects the loosening of the r-ollpressurebetween the middle and the under roller. The device is inserted between bracket 2? and bracket-screw 28 of the middle roller. It mav also be arranged between the bracket and the intermediate block. .l/Vhen the middle roller is held by meansot' Wedges instead of the bracket, it is suhicient to place the device between thewedgeand the interinediate piece.

F or loosening the rollers of the housingframes, it is only necessary to dispose the apparatus in one post, as the pressure is done away with, as soon as one side of the rollers is discharged. I 7

In the rolling-process strong blows are produced between the rollers at the moment when the ingot is seized, so that balls as hard as glass Would be shattered,;whilst not hardened balls would be flattened. To reduce the brittleness of the balls, the balls are tempered at 400 to. 450 C. 1

Instead of balls cylindrical. bodieslrolls) may be employed. The ball-containers are then made of prismatic torn], and the outlet openings of rectangular cross-section.

What- 1 claim is 1. Apparatus tor suddenlvloosening the pressure in rolling-mills. consisting of a suitable container open at the top andlilled with, solid bodies capable of running out'ot the said container, a cover closing. the said container adapted to sink into the same, and means for suddenly reducing the quan tity of thesaid bodies contained'in the said container.

2. Apparatus for suddenly loosening the pressure in rolling-mills, consisting of a suitable container open at the top and filled with balls. a cover closing. the J aid container and adapted to sink into thesa-nie, and means for suddenly reducing the quan tity of the said balls contained in the said container. v

3. Apparatus for suddenlv loosening the pressure in rolling-mills consisting of a suitable container open at the topand filled with solid bodies sliding readily against each other, a cove-r closing the said container and adapted to sink into the same,-and means for suddenly discharging the said bodies out of the said container.

l. Ap )aratus for suddenly loosening the pressure in rolling-mills, consisting-of a suitable container open at the top and filled with steel-balls, a cover closing the said container and adapted to sink into the same, and a plug closing an outlet-opening. provided in the said container.

5. Apparatus for suddenly loosening the pressure in rolling-mills consisting of a suitable container open at the top and filled with steel-balls. a cover closing the said container and adapted to sink into the same,

a plug closing ian'outlet-op'ening provided in the said container; and means for driving a rod into the saidopeningafterremov ingthesaid plug;v

6. Apparatus for suddenly ,loosening the pressure -in'frolling-mills, consisting of a suitable container open at th'e top and filled V provided =5 7. Apparatus forsuddenlv loosening the it pressure in rolling-mills,consisting of a suitable container .open atthe top I and filled with bodies sliding. readily againsteach other, alcover closingthe said container and adapted to sinkzinto the same, a plug use ingan outlet-openingprovided in thebotv tom of the said container, assuitableves sel attached to the said botton1,a rod, and a lever mechanism- ,todrive said rod lnto said opening-after removing the'said plug 7 8. Apparatus EorQsuddenlyloosen ng the pressure in rolling-mills, consisting off-a ring having an interior collar at the bottom; a potlike cover fitting intothe said collar and having at the top a collar fitting into the said ring, the space between the rii ig and the cover being filled with. bodies sliding readily against each other, and means tor suddenlyfreduc'ing the quantity of the saidobodies-j 9. Apparatus for suddenly looseningithe 1 pressure-91n rolling-mills ,consisting of a ring hajvlnginn interior collar at the bottom; an annulariiroove int'he-said'collar, a potlike" cover fi tinginto the said collar and.

having at the top a collar fitilll'lgfllltOi the said ring, the space'between the ring and the cover being filledfwith bodies sliding readily against eachother,- and means to!" passing the said bodies into the said annular groove.

10. Lpparatus for suddenly loosening the pressure infrolllng mills, comprising a stationar wed e between the intermediate piece and the bracket of the standard with a' cavity filled with bodies slidingreadily against each other, closing the said cavity with a fitting; cover, and providing means for suddenly reducingthe quantity of the said bodies contained in the said cavity.

11. ,Apparatus forsuddenly loosening the pressure inrolling-mills, consisting of n suitablecontainer open at the top and filled with bodies sliding readilYagainst each other, a cover closing the saidcontainer and adapted to sink intothe same, and means for regulating the pressure exerted by the said bodies,

12. Apparatus for suddenly loosening the pressure in rolling-mills, consisting of a suitable container open at the top and filled with bodies sliding readily against each other, a cover closing the said container and 1 adapted to sink into the'same, a cylinder v v V METZ" communicating Withthe said container, and; Witnesses: e Weight-changed piston operating in'the said cylinder.

In testimony whereof I afiix my signature in presence of tWo Witnesses; v r

T. S. SC AEFER, J. M LLER. 

